Study On The Wight Of Reticulated Shell And Cable Support System In The Suspen-dome

The suspen-dome is a new type of composite space prestressing structure with mixed rigidity and flexibility on the basis of the upper reticulated shell structure,which effectively solves the problems of small span of the upper reticulated shell structure and poor stability.It is widely used in large span public buildings,such as large gymnasinum airport terminal and exhibition center,because of its reasonable force and graceful form.However,the performance of the suspen-dome is seriously controlled by its construction quality,the error of the node position and the pre-stress loss of the cable-staying system during the construction process will inevitably affect the structure.The paper is based on the suspen-dome of Shangdong Renping Gymnasium On the basis of considering the the error of the node position and the pre-stress loss of the cable-staying system,the failure mode of the suspen-dome under different load forms is carried out.At the same time,based on the reliability theory,the weight of the upper reticulated shell structure and the lower cable-supporting system in the suspen-dome are quantitatively analyzed.The work and main conclusions of the thesis are as follows:Firstly,On the basis of consulting a large number of related literatures at home and abroad,this paper briefly introduces the classification of suspendome and the development history,engineering application and research status of suspendome.The problems related to the stability of the suspendome structure are expounded.Taking the suspendome of the Renping gymnasium in Shangdong as the research object,the stability analysis is carried out,and the most unfavorable bucking mode of the full-span load and half-span load and wind load is obtained.By summarizing the presstrss loss of the actual engineering and experimental model,the distribution law of the traditional node friction coefficient and the new node friction coefficient is studied The research finds that the traditional node friction coefficient obeys the mean distribution of 0.12446 and the variance of 0.11099,the new node friction coefficient obeys the mean distribution of 0.09868 and the variance of 0.04381.Finally,the uniform defect mode method is used to consider the error of the installation of the upper reticulated shell of the suspen-dome.The maximum pre-stress loss is considered by 10% initial pre-stress,combined with linear buckling analysis and nonlinearity.The ultimate bearing capacity of the suspen-dome under full-span load and half-span load and wind load is analyzed.The failure mode of the structure under different load action forms is studied by back-loading the buckling load.It is found that the failure mode of the suspen-dome under full-span load and half-span load and wind load is unstable failure.Secondly,It is found that the failure mode of the suspendome is unstable under different load forms.Therefore,the weight of the upper single-layer reticulated shell and the lower cable-supporting system in the suspendome is evaluated.it is only necessary to consider the influence of the upper single-layer reticulated shell and the lower cable-supporting system on the stability of the suspendome structure.In this paper,the ultimate bearing capacity is taken as the goal.The life-and-dead element method is used to consider the influence of each unit to the ultimate bearing capacity.Combined with the stable degradation coefficient method and the analytic hierarchy process,the influence of each unit to the ultimate bearing capacity of the upper reticulated shell is first considered.Considering the influence of each unit on the ultimate bearing capacity of the suspendome,the influence of the upper reticulated shell on the ultimate bearing capacity of the suspendome is reversed,and the upper single-layer reticulated shell and the lower strut-supporting system are occupied in the suspendome structure.The weights are 0.89 and 0.11,respectively.